package com.jr.util;

import org.junit.jupiter.api.Test;

import java.util.Random;

/**
 * @Description: 描述
 * @Author: 金宏飞
 * @CreateTime: 2023-01-10  17:27
 * @Version: 1.0
 */
public class UserName {

    public String getStringRandom(int length) {

        String val = "";
        Random random = new Random();

        //参数length，表示生成几位随机数
        for (int i = 0; i < length; i++) {

            String charOrNum = random.nextInt(2) % 2 == 0 ? "char" : "num";
            //输出字母还是数字
            if ("char".equalsIgnoreCase(charOrNum)) {
                //输出是大写字母还是小写字母
                int temp = random.nextInt(2) % 2 == 0 ? 65 : 97;
                val += (char) (random.nextInt(26) + temp);
            } else if ("num".equalsIgnoreCase(charOrNum)) {
                val += String.valueOf(random.nextInt(10));
            }
        }
        return val;
    }
}
